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This moves the transformation introduced in r223757 into a separate MI pass. This allows it to cover many more cases (not only cases where there must be a reserved call frame), and perform rudimentary call folding. It still doesn't have a heuristic, so it is enabled only for optsize/minsize, with stack alignment <= 8, where it ought to be a fairly clear win. (Re-commit of r227728) Differential Revision: http://reviews.llvm.org/D6789 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227752 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
//===-- X86.h - Top-level interface for X86 representation ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the entry points for global functions defined in the x86
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// target library, as used by the LLVM JIT.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_X86_X86_H
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#define LLVM_LIB_TARGET_X86_X86_H
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#include "llvm/Support/CodeGen.h"
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namespace llvm {
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class FunctionPass;
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class ImmutablePass;
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class X86TargetMachine;
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/// createX86ISelDag - This pass converts a legalized DAG into a
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/// X86-specific DAG, ready for instruction scheduling.
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///
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FunctionPass *createX86ISelDag(X86TargetMachine &TM,
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CodeGenOpt::Level OptLevel);
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/// createX86GlobalBaseRegPass - This pass initializes a global base
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/// register for PIC on x86-32.
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FunctionPass* createX86GlobalBaseRegPass();
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/// createCleanupLocalDynamicTLSPass() - This pass combines multiple accesses
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/// to local-dynamic TLS variables so that the TLS base address for the module
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/// is only fetched once per execution path through the function.
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FunctionPass *createCleanupLocalDynamicTLSPass();
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/// createX86FloatingPointStackifierPass - This function returns a pass which
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/// converts floating point register references and pseudo instructions into
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/// floating point stack references and physical instructions.
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///
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FunctionPass *createX86FloatingPointStackifierPass();
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/// createX86IssueVZeroUpperPass - This pass inserts AVX vzeroupper instructions
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/// before each call to avoid transition penalty between functions encoded with
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/// AVX and SSE.
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FunctionPass *createX86IssueVZeroUpperPass();
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/// createX86EmitCodeToMemory - Returns a pass that converts a register
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/// allocated function into raw machine code in a dynamically
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/// allocated chunk of memory.
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///
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FunctionPass *createEmitX86CodeToMemory();
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/// createX86PadShortFunctions - Return a pass that pads short functions
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/// with NOOPs. This will prevent a stall when returning on the Atom.
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FunctionPass *createX86PadShortFunctions();
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/// createX86FixupLEAs - Return a a pass that selectively replaces
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/// certain instructions (like add, sub, inc, dec, some shifts,
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/// and some multiplies) by equivalent LEA instructions, in order
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/// to eliminate execution delays in some Atom processors.
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FunctionPass *createX86FixupLEAs();
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/// createX86CallFrameOptimization - Return a pass that optimizes
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/// the code-size of x86 call sequences. This is done by replacing
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/// esp-relative movs with pushes.
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FunctionPass *createX86CallFrameOptimization();
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} // End llvm namespace
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#endif
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